Question

1. Which of these algae is multicellular? A) Chlamydomonas B) Spirogyra C) Chlorella D) Volvox 2. What happens when the acidity of milk increases? A) It coagulates. B) It becomes watery. C) It becomes powdery. D) It releases white fumes. 3. What happens to the speed of a moving car when force is applied in the opposite direction? A) It increases. B) It decreases. C) It remains as is. D) It increases first and then decreases. 4. Pregnancy is also known as _____________. A) incubation B) gestation C) ovulation D) puberty 5. Which of these forms of coal contains the highest amount of carbon? A) peat B) lignite C) anthracite D) bituminous coal 6. Which of these supplements, when added to the soil, would not contribute to pollution? A) urea B) potash C) compost D) ammonium sulphate 7. Which of these particles are present in the nucleus of an atom? A) proton and neutron B) electron and proton C) neutron and electron D) electron, neutron and proton 8. A builder wants to construct a party hall and is looking for ways to reduce noise pollution due to parties in this hall. Which of these suggestions is incorrect? A) The hall should not be built near schools or hospitals. B) The hall should use minimal carpets, cushions and curtains. C) The hall should not be used to host parties where music is played loud. D) The hall should not be used to host parties late at night. 9. A milk factory produces packets of milk every day. Which of these plastics must be used in this factory for packing purposes? A) Bakelite B) Polystyrene C) Polythene D) Teflon 10. Pick the odd one out. A) frog B) birds C) butterfly D) crocodile ​

Answer 1

Answer:

Chlamydomonas is a genus of green algae. They are unicellular flagellates, found in stagnant water and in damp soil, in freshwater, seawater, and even in snow as "snow algae".

Two filaments of cytoplasm, flagella, extend from one end, and their whip-like lashings pull the Chlamydomonas through the water and rotate it at the same time. A single, cup-shaped chloroplast occupies the greater part of the cell.

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